I’ve got a 2004 Silverado 2500, crewcab, longbed with a 8100cc gas engine. The truck has 80,000 miles and is in great condition. There’s just one little problem - the climate cntrol system will occassionally go to completely hot. When it started a couple years ago, it was weeks between occurences. Now it’s about every day and can be multiple times a day. When the system goes to hot, the only way to get back to the proper setting is to turn off the ignition and then restart.
It was happening on both the driver and passenger sides, but the first attempt to repair this issue was to change the envirenmental control computer - now the heat only happens on the driver side. The passenger side remains as set.
The repair shop has tried 5 times to fix the issue and is now stumped. Any help would be appreciated.